Looks like a nice little laser set. I have the cheapo china 40w blue and white laser cutter but not sure mirror and lenses are aligned. Still need to find some time to set it up.
What kind of photoresist do you use? I saw that blue dry film thing on eBay but I'm skeptical. I have a UV sterilizer bread-box so exposing it should work. Getting a hold of SU-8 seems tricky especially with all the viscosities available. Would also need to make a wafer spinner or hack a microcentrifuge sans rotor from one of those super cheap offers on eBay to hold a suction cup....i don't trust myself with making one diy and keeping it balanced at high speeds. Also with SU-8 you need a bunch of extra stuff to silanize the water so it doesn't stick to the pdms and the etchant and whatnot. At the same time you only need to make one master and you'll be set for many many recasts. Currently in trying to get a decent vacuum in my hacked Pyrex bottle to spark an oxygen plasma for treating the pdms and glass slide. Know how long the hydrophilic silanol groups last? Any means of storing?
Sebastian S. Cocioba
CEO & Founder
New York Botanics, LLC
Plant Biotech R&D
What kind of photoresist do you use? I saw that blue dry film thing on eBay but I'm skeptical. I have a UV sterilizer bread-box so exposing it should work. Getting a hold of SU-8 seems tricky especially with all the viscosities available. Would also need to make a wafer spinner or hack a microcentrifuge sans rotor from one of those super cheap offers on eBay to hold a suction cup....i don't trust myself with making one diy and keeping it balanced at high speeds. Also with SU-8 you need a bunch of extra stuff to silanize the water so it doesn't stick to the pdms and the etchant and whatnot. At the same time you only need to make one master and you'll be set for many many recasts. Currently in trying to get a decent vacuum in my hacked Pyrex bottle to spark an oxygen plasma for treating the pdms and glass slide. Know how long the hydrophilic silanol groups last? Any means of storing?
Sebastian S. Cocioba
CEO & Founder
New York Botanics, LLC
Plant Biotech R&D
> Tom's link worked perfectly. Thanks for the effort Dakota! Gonna see how
> small of a feature I can shrinky dink. I was planning some circuit like this
> last year but never got around to it. Worried the 20um posts will be too
> difficult to print and shrink properly. Even at the shrink rate of 63%
> (cited in shrinkydink microfluidics paper) I'd still need around 40um
> initial features so well see. Worst case maybe a series of smaller and
> smaller pillars. I'll post files once I get comfy with draftsight and thing
> actually works.
>
I just bought this yesterday for exposing photoresist, to use for
imprinting silicone, or maybe for use as a lithography photomask.
http://www.ebay.com/itm/Mini-Laser-200-250mW-Engraving-Machine-DIY-Carving-Logo-Picture-Marking-Printer/261591526091
The ebay listing says it is accurate to 10 microns, but I doubt the
laser spot will even be that small. Also I am not sure if that number
is realistic or just made up... but the stepper controller does have
microstepping so I have hope. I have a few ideas for upgrading the
laser, basically just adding a tube to hold the laser unit from a
blu-ray drive (because the optics in that have tons and tons of
engineering behind them to make them near perfect), or adding better
lenses and a pinhole in an optical tube.
Also it uses open-source hardware which is pretty cool, and I think
this is the relevant line of code to set the resolution of the
software:
https://github.com/grbl/grbl/blob/615093ccd2a9bd63f1ecd29c464f032000f5e626/defaults.h#L50
I recently made this in implicitCAD, I haven't made anything else
yet... but I will give your fluidic a shot!
https://github.com/nmz787/microfluidic-cad/blob/master/implicitCAD/output/sinusoidal_mixer.png
--
-- You received this message because you are subscribed to the Google Groups DIYbio group. To post to this group, send email to diybio@googlegroups.com. To unsubscribe from this group, send email to diybio+unsubscribe@googlegroups.com. For more options, visit this group at https://groups.google.com/d/forum/diybio?hl=en
Learn more at www.diybio.org
---
You received this message because you are subscribed to the Google Groups "DIYbio" group.
To unsubscribe from this group and stop receiving emails from it, send an email to diybio+unsubscribe@googlegroups.com.
To post to this group, send email to diybio@googlegroups.com.
Visit this group at http://groups.google.com/group/diybio.
To view this discussion on the web visit https://groups.google.com/d/msgid/diybio/CA%2B82U9J6Pec3M%3DE5RyNVPJynfE-GnMoBLy8UJu4PV562hLmvvA%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
0 comments:
Post a Comment